Truth About Biology

Did You Inherit Fat Genes: The Truth About Biology And Body Fat
By Tom Venuto

"Battle Your Biology? Fat Chance," proclaimed a headline recently in the health section of the New York Post newspaper. Quoting new research and citing psychologists, dietitians and physicians, the article says that more and more evidence proves that your weight is genetically determined, and if you're fat, "it's not your fault." "We've known for a while that genes - more than environment and behavior - explain obesity" argues Dr. James Rosen, an eating disorder specialist and professor at the University of Vermont.

While genetics are definitely a factor, believing you are destined to be overweight for life because you've inherited "fat genes" is the most disempowering and self-defeating attitude you could ever adopt. The only way you’ll lose weight permanently is to accept total responsibility for yourself and acknowledge the fact that you have the power to change, regardless what mother nature has given you to work with.

There's no denying that heredity plays a major role in how difficult it will be for you to lose fat. You inherited a body type, a predetermined number of fat cells, a metabolic rate and body chemistry just as you inherited your eye color and hair color. In the 1930's, Harvard psychologist Dr. William H. Sheldon developed a classification system for these different body types called "somatotyping." While there are no absolutes, Sheldon identified three basic somatotypes: ectomorphs, mesomorphs and endomorphs.

Ectomorphs are the lean, lanky types. They are usually very thin and bony, with fast metabolisms and extremely low body fat. An ectomorph can eat like a horse without gaining an ounce. Mesomorphs are the "genetically gifted." They are lean, muscular and naturally athletic. Mesomorphs lose fat and gain muscle with ease. Endomorphs are the "fat retainers." Characterized by round features, excess body fat and large joints ("big bones"), endomorphs usually have great difficulty in losing body fat. They have slow metabolisms, they are often carbohydrate sensitive, they gain fat quickly if they eat poorly or don't exercise, and they lose fat slowly - even on a healthy diet.

The tendency of endomorphs to store fat easily can be partly attributed to metabolic problems. For example, endomorphs often metabolize carbohydrates inefficiently. Normal people can eat lots of carbohydrates - up to 60% of their total calories - and they still stay lean. Endomorphs produce too much insulin when they eat carbohydrates and this leads to increased fat storage and difficulty in losing existing fat. This condition is known as "insulin resistance" or "Syndrome X."